The spear was the greatest battle implement ever devised. Patton knew that.
There is this guy named George C. Patton who is supposed to have declared that the M1 Garand was the "greatest battle implement ever devised".
I'd suggest that a catch-all-cure to VD/STI's would be at the top of the list.
M1/M2 Carbine needs to be in this discussion lol.
There is no discussion because the clear answer if we are limiting it to firearms only is the AK-47 it was adopted by something like 70 countries and has been involved in just about every conflict on Earth from the day it was invented and they are cheap and reliable and simple enough for an illiterate conscript. It can argued that they aren't the most sophisticated or accurate but a battle rifle isn't a precision rifle it just needs to throw bullets reliably and hit a man sized target and that gives the win to the AK-47.
It's a post war design though, thought this was a WW2 rifle thread...
The Stgw.44 is still used in combat after 70 years, this really says it all.
Patton was wrong.
1) STG44
2) SVT40
3) Garrand
The STG44 is the "grandfather" of the "assault rifle". Hitler actually coined the term for propaganda. A lot of people are under the belief that it wasn't widely fielded. It was. Only predominantly on the Eastern front. It was field tested by parachute drop to an encircled German division. That German division armed up and fought their way through the Russian troops. It was said to have given them the equivalent of three divisions fire power. More importantly it was a change in philosophy and the infamous AK47/74 is based on it. Many gave me grief when I previously stated the obvious that the Russians copied it and put their own spin/design ideas on it to make the AK. kalashnikov himself a few years ago confirmed this after the huge amount of Russian propaganda denial.
The AK-47 was inspired/based on the STG44 so it counts and was much more successful than any of the three choices we were given to pick from.